This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 51 |
| 4 | 460 |
| 5 | 5425 |
| 6 | 79206 |
| 7 | 1377985 |
| 8 | 27801096 |
| 9 | 637630353 |
| 10 | 16376303530 |
| 11 | 465451009441 |
| 12 | 14501512561548 |
| 13 | 491394769892377 |
| 14 | 17991533604051294 |
| 15 | 707766894441628785 |
| 16 | 29771014384775612176 |
| 17 | 1333347506427522171169 |
| 18 | 63346663190991936656466 |
| 19 | 3182006256289160385596833 |